Security Inks for Textile Applications and other Research Topics of DITF

Dr. Reinhold Schneider, DITF Denkendorf, Germany

Booth 2036

German Institutes of Textile and Fiber Research

• Europe‘s largest textile research center, approx. 300 empolyees, 30 Mio € turnover

• Founded in 1921, foundation under public law

• 3 research centers, 1 production company (ITVP)

• Application oriented research from molecule to product on 25,000 m2

• Research with industrial pilot facilities, focus on technical textiles and life sciences

• Connected to University of Stuttgart and Reutlingen University by 3 chairs and 2 professorships

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German Institutes of Textile and Fiber Research

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Architecture and Construction 8%

Health and Care 10%

Mobility 15%

Energy and Environment 19%

Production Technologies 38%

Clothing and Home Textiles 10%

Research fields Application fields (2016)

High Performance

Fibers and Yarns

Functionalized

Textiles and

Finishing

Lightweight Design

and Fiber

Composites

Medical

Technologies

Smart Textiles

Textile 4.0

The Idea of Transparent Security Inks (Transparency™)

Trägerschicht

Visualisation of

transparent codes

using IR-light and IR-camera

Communication

with Database server Decoding of

Datamatrix-Codes

Digital printing of invisible

IR-active security tags

(Datamatrix-Code) • Challenge in security marking

- Invisible for human eye

- Ink formulation

- Fastness (fixation of IR-active

pigments with binder)

- Decoding of printed code

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IR-activity of particles and binders

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Selection of ink ingredients

• Selection of pigments on basis of

• IR-contrast

• VIS-Transparancy

• Dispersion stability

• Filterability

• Selection of binders on basis of

• VIS-Transparency

• Printability, filterability

• Soft hand

• High fastness level

• Compatibility with pigments

Ink formulation

• Manufacturing of pigment dispersions

- 4h grinding of pigments (IR-active pigments

and dispersants in nanomill (picoline)

- Particle size <100 nm

- 26 IR-additives under investigation

• Addition of chemicals

-Dilution (< 0,1% IR)

-Binders (5%)

-Additives (up to 5%)

• Filtration

Filtration down to 0,8 µm

Particle size < 100nm

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Viscosity =1,43 mPas

Surf.tension =33,9 mN/m

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Measurement setup for the detection of security tags

NIR flood light

Textile sample without IR-radiation

IR camera

Textile sample with IR-radiation

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Properties of Transparency™ Ink

Paper Co

R122

PET

foil

PET

ecodis

p210

PA R69 Conex

R132

Kevlar Leather

crust

PVC

Printability

Resistant to

rubbing (dry)

Rubbing (wet)

Detection &

Decoding

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Visualisation of security code using IR-radiation & IR-camera

Visualized security tag using IR-cam & IR-light

Security inks (Transparency™)

Inkjet printing of

datamatrix code

• Invisible for human eye

• High fastness level

• Decodable

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• Electrical switch

• Sensors for composites

• Heating element Electroluminescence UV-active

…

Digital printing of functional layers on textiles

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Expertise

Pre-treatment for inkjet printing

Ink formulation

Functional inks

- Pressure sensitive pad

based on ohmic

resistance and capacitivity

(on/off switch)

- Deformation sensitive

structures based on

ohmic resistance

(measurement of

mechanical stress)

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Functionalization of Textiles using Ionic Liquids

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Expertise Formulation of coatings

out of ionic liquids

New material combinations

Ionic liquids (ILs) as

solvent for

Chitin

Cellulose

Polyamide

Aramide

Excellent adhesion

on various substrates

(PA, PET, Co..)

Morphology depends

on coating polymer

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PURCELL – a Sustainable Composite

Material of Pure Cellulose

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The PURCELL principle and approach

Biopolymer cellulose is used as both, the reinforcement fiber and the matrix material

Reinforcement cellulosic fibers are used in form of textiles

The cellulosic matrix is realized with pure cellulose dissolved in an ionic liquid

The composite material is built up layer by layer via impregnation of the respective textile

Subsequently, IL is removed in a water bath

The composite material is dried and consolidated via hot pressing.

Fiber reinforced composite made of pure cellulose

Excellent fibre-matrix adhesion

Recyclable, biodegradable

Good mechanical performance

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Development of Ceramic Fibers for High Temperature Light Weight Construction

Pilotline for the development of continuous oxide ceramic fibers

(alumina, mullite etc.(kg scale) at DITF.

Long term temperature resistance above 1000°C.

Ceramic fibers determine the performance of CMCs (ceramic matrix

composites).

Ceramic matrix composites are new non brittle ceramic materials

(fiber reinforced ceramics) with high potential for different technical

applications

Potential fields of application: aerospace, power engineering,

industrial furnaces, batch racks for temperature treatment…

http://americanmachinist.com/news/

ge-aviation-vows-blueprint-cmc-

material-production

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The Future is Textile